nlinv: re-scale option, fix normalize for sensitivities, minor changes
nlinv: re-scale option, fix normalize for sensitivities, minor changes

Takishima/bart,sdimoudi/bart,mrirecon/bart,sdimoudi/bart,Takishima/bart,Takishima/bart,sdimoudi/bart,sidward/bart,mrirecon/bart,sidward/bart,Takishima/bart,mrirecon/bart,mrirecon/bart,sidward/bart,sdimoudi/bart,sdimoudi/bart,Takishima/bart,sidward/bart,mrirecon/bart,sidward/bart